When you buy from such online stores check if the fish is dried with salt(normally fish is added with lot of salt before drying). If it is with lot of salt i dont think it is good. From my discussion with few of my friends who did aquaculture they say they feed them fresh SALT WATER prawns to enhance colour(Please note that it is not my personal experience).

@ As mentioned by Jaiby, all these fishes put-up in the website is sold for human consumption and they would have definitely dried the fishes with salt in it. So make sure that it does not contain any salt and only then feed your fishes. May be you can try contacting the supplier and gather more information.

Thanks for the helpful replies.
they are in a 55 gals aquarium , other cichlids are half of the size of oscar. They eat too much. My water parameters are stable. And obviously Oscar is the BOSS.

Generally when i see red tiger oscar in pics or stores, they are intensely coloured. Mine one is light orange on just lower half of its body. my O also lighten and darken its black color. Can i know why this happens and in which condition?

Water changes are essential to coloration and quality of life. Good filters also play a good role.
Coloration will not significantly improve if you are fishes are genetically light colored. You can expect slight improvement.
one way you can give a try in terms of food is if you have spirulina and carotene content in your food.
There are many hobbyists including me who have made DIY food for improving food and ingredient quality.

The intense colour seen in LFS is normally due to hormone induced feed, this colour fades as soon as hormone induced feed is stopped.
If the fish is healthy otherwise, do not worry, oscars are not very bright red coloured.

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